Spring cloud 尤里卡从不注销服务

我目前面临一个问题，Eureka不会注销已注册的服务。我直接从git hub中提取了Eureka服务器示例，只做了一个更改，

Eureka.enableSelfPreservation=false

。My application.yml如下所示：

server:
  port: 8761
eureka:
  enableSelfPreservation: false
  client:
    registerWithEureka: false
fetchRegistry: false
  server:
    waitTimeInMsWhenSyncEmpty: 0

eureka:
  instance:
    leaseRenewalIntervalInSeconds: 3
  client:
    healthcheck:
      enabled: true
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
  appInfo:
    replicate:
      interval: 3
    initial:
      replicate:
        time: 3
spring:
  rabbitmq:
    addresses: ${vcap.services.${PREFIX:}rabbitmq.credentials.uri:amqp://${RABBITMQ_HOST:localhost}:${RABBITMQ_PORT:5672}}

我已经读到，如果85%的注册服务在15分钟内停止提供心跳，Eureka会假设问题与网络相关，不会取消注册没有响应的服务。在我的例子中，我只有一个服务在运行，所以我禁用了自我保护模式。我突然终止了这个过程，而Eureka离开服务的注册时间似乎是无限期的

我客户的application.yml如下所示：

server:
  port: 8761
eureka:
  enableSelfPreservation: false
  client:
    registerWithEureka: false
fetchRegistry: false
  server:
    waitTimeInMsWhenSyncEmpty: 0

eureka:
  instance:
    leaseRenewalIntervalInSeconds: 3
  client:
    healthcheck:
      enabled: true
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
  appInfo:
    replicate:
      interval: 3
    initial:
      replicate:
        time: 3
spring:
  rabbitmq:
    addresses: ${vcap.services.${PREFIX:}rabbitmq.credentials.uri:amqp://${RABBITMQ_HOST:localhost}:${RABBITMQ_PORT:5672}}

我的目标是创建一个演示，其中Eureka可以快速检测到服务不再运行，而另一个启动的服务可以快速注册

现在，一旦启动eureka客户端，它将在3秒钟内注册。当服务突然终止时，它永远不会取消注册。在我终止服务后，Eureka仪表板显示：

紧急情况！EUREKA可能错误地声称实例在未启动时已启动。续订小于阈值，因此实例不会为了安全而过期

---

如何防止这种行为？

我意识到自我保护模式实际上从未被禁用。事实证明，实际属性是

eureka.server.enableSelfPreservation=false

---

（参见代码），我在任何地方都没有找到文档。这解决了我的问题。

我通过设置以下值使服务取消注册生效

Eureka server application.yml

eureka:
  server:
    enableSelfPreservation: false

eureka:
  instance:
    leaseRenewalIntervalInSeconds: 1
    leaseExpirationDurationInSeconds: 2

服务应用程序.yml

eureka:
  server:
    enableSelfPreservation: false

eureka:
  instance:
    leaseRenewalIntervalInSeconds: 1
    leaseExpirationDurationInSeconds: 2

---

这里是完整的示例

经过一番努力，如果有任何服务由于某些问题而从Eureka服务器注销，我最终得到了解决方案。它将通过扩展Eureka服务器API的HealthCallback通知管理员。 比如说服务——在尤里卡登记。因此，Eureka客户端与服务A集成，并在服务A中实现以下回调

服务-A【尤里卡客户】 在属性文件中添加以下属性

#Eureka Configuration
eureka.client.eureka-server-port=8761
eureka.client.register-with-eureka=true
eureka.client.healthcheck.enabled=false
eureka.client.prefer-same-zone-eureka=true
eureka.client.fetchRegistry=true
eureka.client.serviceUrl.defaultZone=${eurekaServerURL1}, ${eurekaServerURL2}
eureka.client.eureka.service-url.defaultZone=${eurekaServerURL1}, ${eurekaServerURL2}
eureka.instance.hostname=${hostname}
eureka.client.lease.duration=30
eureka.instance.lease-renewal-interval-in-seconds=30
eureka.instance.lease-expiration-duration-in-seconds=30

添加以下java文件

@Component
public class EurekaHealthCheckHandler implements HealthCheckHandler, ApplicationContextAware, InitializingBean {


    static Logger logger = LoggerFactory.getLogger(EurekaHealthCheckHandler.class);

    private static final Map<Status, InstanceInfo.InstanceStatus> healthStatuses = new HashMap<Status, InstanceInfo.InstanceStatus>() {{
        put(Status.UNKNOWN, InstanceInfo.InstanceStatus.UNKNOWN);
        put(Status.OUT_OF_SERVICE, InstanceInfo.InstanceStatus.OUT_OF_SERVICE);
        put(Status.DOWN, InstanceInfo.InstanceStatus.DOWN);
        put(Status.UP, InstanceInfo.InstanceStatus.UP);
    }};

@Autowired
ComunocationService comunocationService ;
    private final CompositeHealthIndicator healthIndicator;

    private ApplicationContext applicationContext;

    public EurekaHealthCheckHandler(HealthAggregator healthAggregator) {
        Assert.notNull(healthAggregator, "HealthAggregator must not be null");
        this.healthIndicator = new CompositeHealthIndicator(healthAggregator);

        Health health = healthIndicator.health();
        logger.info(" =========== Testing =========== {}", health.toString() );
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    @Override
    public void afterPropertiesSet() throws Exception {

        final Map<String, HealthIndicator> healthIndicators = applicationContext.getBeansOfType(HealthIndicator.class);
        for (Map.Entry<String, HealthIndicator> entry : healthIndicators.entrySet()) {
            logger.info("======"+ entry.getKey() +"============= "+entry.getValue());
            healthIndicator.addHealthIndicator(entry.getKey(), entry.getValue());
        }
    }

    @Override
    public InstanceInfo.InstanceStatus getStatus(InstanceInfo.InstanceStatus instanceStatus) {
        logger.info("============== Custome Eureka Implementation ==================="+ getHealthStatus());
        return getHealthStatus();
    }

    protected InstanceInfo.InstanceStatus getHealthStatus() {
        final Status status = healthIndicator.health().getStatus();
        return mapToInstanceStatus(status);
    }

    protected InstanceInfo.InstanceStatus mapToInstanceStatus(Status status) {
        logger.info("============== Test Custome Eureka Implementation ==================={}", status);
        if(status.equals(InstanceInfo.InstanceStatus.UP)) {
            // Send mail after configured times
              comunocationService.sendEmail("ServiceName");
        }
        if(!healthStatuses.containsKey(status)) {
            return InstanceInfo.InstanceStatus.UNKNOWN;
        }
        return healthStatuses.get(status);
    }

    public void getstatusChangeListner() {
        ApplicationInfoManager.StatusChangeListener statusChangeListener = new ApplicationInfoManager.StatusChangeListener() {
            @Override
            public String getId() {
                return "statusChangeListener";
            }
            @Override
            public void notify(StatusChangeEvent statusChangeEvent) {
                if (InstanceStatus.DOWN == statusChangeEvent.getStatus() ||
                        InstanceStatus.DOWN == statusChangeEvent.getPreviousStatus()) {
                    // log at warn level if DOWN was involved
                    logger.warn("Saw local status change event {}", statusChangeEvent);
                } else {
                    logger.info("Saw local status change event {}", statusChangeEvent);
                }

            }
        };
    }


}

---

这是绝对有效且经过良好测试的代码

您使用的是哪个版本的spring cloud？我有两个项目正在进行中，在我直接从GitHub获得的示例中，我使用的是1.1.0。在我的实际项目中，我使用SpringCloudStarter配置1.0.3。也没有注销客户端。您实际等待了多长时间？我可以花一些时间取消默认设置的注册。我听说应该需要90秒到4分钟，但我已经等了一个多小时。我停止了服务，去吃午饭，刷新了Eureka仪表板，服务仍在显示。针对此问题向文档回购请求可能对许多其他人非常有帮助。。。如果有人还没有这样做。这些值不是太短了吗？这些值只是示例，根据您的用例，您必须找到正确的值。上述设置将在eureka服务器上增加更多负载，但会降低将流量转发到非工作服务的风险